A68G(1) Programmer's Manual A68G(1) NAME a68g - Algol 68 Genie, an Algol 68 compiler-interpreter SYNOPSIS a68g [--apropos | --help | --info [string]] [--assertions | --no-assertions] [--backtrace | --no-backtrace] [--brackets] [--check | --no-run] [--compile | --no-compile] [--clock] [--debug | --monitor] [--echo string] [--execute unit | -x unit] [--exit | --] [--extensive] [-f | --file string] [--frame number] [--handles number] [--heap number] [--listing] [--moids] [-O | -O0 | -O1 | -O2 | -O3] [--object | --no-object] [--overhead number] [--optimise | --no-optimise] [--pedantic] [--portcheck | --no-portcheck] [--pragmats | --no-pragmats] [--precision number] [--prelude-listing] [--pretty-print] [--print unit | -p unit] [--quiet] [--quote-stropping] [--reductions] [--rerun] [--run] [--script string] [--source | --no-source] [--stack number] [--statistics] [--strict] [--terminal] [--time-limit number] [--trace | --no-trace] [--tree | --no-tree] [--unused] [--upper-stropping] [--verbose] [--version] [--warnings | --no-warnings] [--xref | --no-xref] filename DESCRIPTION Algol 68 Genie (Algol68G) is an Algol 68 compiler-interpreter. It can be used for executing Algol 68 programs or scripts. Algol 68 is a rather lean orthogonal general-purpose language that is a beautiful means for denoting algorithms. Algol 68 was designed as a general-purpose programming language by IFIP Working Group 2.1 (Algorithmic Languages and Calculi) that has con- tinuing responsibility for Algol 60 and Algol 68. Algol 68 Genie and its documentation can be obtained from https://jmvdveer.home.algol68genie.nl/ OPTIONS Options are passed to a68g either from the file .a68g.rc in the working di- rectory, the environment variable A68G_OPTIONS, the command-line or from pragmats. Option precedence is as follows: pragmat options supersede command-line op- tions, command-line options supersede options in environment variable A68G_OPTIONS, A68G_OPTIONS supersedes options in .a68g.rc. Listing options, tracing options and -pragmat, -nopragmat, take their ef- fect when they are encountered in a left-to-right pass of the program text, and can thus be used, for example, to generate a cross reference for a par- ticular part of the program. Where numeric arguments are required, suffices k, M or G are allowed for multiplication with 2 ** 10, 2 ** 20 or 2 ** 30 respectively. --apropos | --help | --info [string] Print info on options if string is omitted, or print info on string otherwise. --assertions | --no-assertions Control elaboration of assertions. --backtrace | --no-backtrace Control whether a stack backtrace is done in case a runtime-error occurs. --brackets Consider [ .. ] and { .. } as being equivalent to ( .. ). Tradi- tional Algol 68 syntax allows ( .. ) to replace [ .. ] in bounds and slices. --check | --no-run Check syntax only, the interpreter does not start. --clock Report execution time excluding time needed for compilation. --compile | --no-compile Switch compilation of units on or off. Compilation omits many of the runtime checks offered by the interpreter proper. The program is not executed and a shell script is generated combining source code and its shared library. This shell script can be used as a pseudo-executable. --debug | --monitor Start in the monitor. Invoke the monitor in case a runtime-error occurs; the program will pause in the monitor on the line that con- tains the error. --echo string Echo string to standout. --execute unit | --x unit Execute the Algol 68 unit. In this way one-liners can be executed from the command line. --exit | -- Ignore further options. --extensive Generate an extensive listing. -f | --file string Accept string as filename in case it conflicts with shell syntax. --frame number Set the frame stack size to number bytes. --handles number Set the handle space size to number bytes. --heap number Set the heap size to number bytes. --listing Generate a concise listing. --moids Generate an overview of modes in the listing file. --object | --no-object Control the listing of C code in the listing file. --optimise | --no-optimise Switch compilation of units on or off. Compilation omits many of the runtime checks offered by the interpreter proper. This option is equivalent to -O2. -O | -O0 | -O1 | -O2 | -O3 Switch compilation of units on and pass the option to the back-end C compiler to set the optimiser level. --overhead number Set overhead for stack checking. --pedantic Equivalent to --warnings --portcheck --portcheck | --no-portcheck Enable or disable portability warning messages. --pragmats | --no-pragmats Control elaboration of pragmats. --precision number Set the precision for LONG LONG modes to number significant digits. --prelude-listing Generate a listing of preludes. --pretty-print Pretty-print the source file. --print unit | --p unit Print the value yielded by the Algol 68 unit. In this way one-lin- ers can be executed from the command line. --quiet Suppress all warning messages. --quote-stropping Use quote stropping. --reductions Print reductions made by the parser. --rerun Use compiled code of a previous run. --run Override the --no-run option. --script string Takes string as source file name and skips further option process- ing so these can be handled by the script. --source | --no-source Control the listing of source lines in the listing file. --stack number Set the stack size to number bytes. --statistics Generate statistics in the listing file. --strict Ignores extensions to Algol 68 syntax. --time-limit number Interrupt the interpreter after number seconds, generating a time limit exceeded error. --trace | --no-trace Control tracing of the running program. --tree | --no-tree Control listing of the syntax tree in the listing file. --unused Generate an overview of unused tags in the listing file. --upper-stropping Use upper stropping, which is the default stropping regime. --verbose Use verbose mode. --version Print the version of the running image of a68g. --warnings | --no-warnings Enable warning messages or suppress suppressible warning messages. --xref | --no-xref Control generation of a cross-reference in the listing file. AUTHOR Author of Algol 68 Genie is Marcel van der Veer <algol68g@algol68genie.nl>. LINUX July 6, 2026 A68G(1)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | AUTHOR
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